OpenTenBase · Jimmy385898 · Jan 31, 2024
diff --git a/docs/guide/06-switching.en.md b/docs/guide/06-switching.en.md
@@ -0,0 +1,235 @@
+# Active/standby switchover
+
+> In [Quick Start](01-quickstart.md) this article, we introduce the architecture of OpenTenBase, source code compilation and installation, cluster running status, startup and stop, etc. > > In [Application Access Guide](02-access.md), we introduced how the application connects to the OpenTenBase database for database creation, table creation, data import, query, and other operations. > > In [Basic Usage](03-basic-use.md), we describe the unique shard tables, hot and cold partition tables, the creation of replicated tables, and basic DML operations in OpenTenBase. > > In [Advanced Usage](04-advanced-use.md), we introduce the advanced use and operation of OpenTenBase, including the use of various window functions, Json/Jsonb, cursors, transactions, locks, etc. > > In [Component Installation and Management](05-component.md), we go deep into the various components of OpenTenBase, and make a separate detailed introduction to the initialization, parameter configuration, start and stop, running status view, and routing effective configuration of various components. > > In this article, we will describe in detail how to switch the active and standby roles of various components within OpenTenBase.
+
+## Environment deployment
+- Number of servers
+
+  2 sets, IP: 172.16.0.29, 172.16.0.47
+
+- Hardware configuration
+
+  CPU: 4-core Memory: 8G System Disk: 50G Data Disk: 200G
+
+- Operating system requirements
+
+  centos7.3
+
+## Create an OS user
+-	Create an operating system running user
+
+
+```
+[root@VM_0_29_centos ~]# adduser -d /data/opentenbase opentenbase
+```
+
+-	Configure the operating system user password
+
+
+```
+[root@VM_0_29_centos pgxztmp]# passwd opentenbase
+```
+
+-	Create the opentenbase application run directory
+
+
+```
+[root@VM_0_29_centos pgxz]# su opentenbase  
+[opentenbase@VM_0_29_centos install]$ mkdir -p /data/opentenbase/install/pgxz
+```
+
+-	Create the opentenbase data directory
+
+
+```
+[root@VM_0_29_centos pgxz]# su opentenbase  
+[opentenbase@VM_0_29_centos install]$ mkdir -p /data/opentenbase/data/pgxz
+```
+
+-	Upload the pgxz application to the directory/data/opentenbase/install/pgxz. The directory structure is
+
+
+```
+[opentenbase@VM_0_29_centos pgxz]$ ll /data/opentenbase/install/pgxz
+total 4
+drwxrwxr-x 2 pgxz pgxz 4096 Nov 10 04:33 bin
+drwxrwxr-x 4 pgxz pgxz  189 Nov 10 04:33 include
+drwxrwxr-x 4 pgxz pgxz  172 Nov 10 04:33 lib
+drwxrwxr-x 3 pgxz pgxz   24 Oct  1 14:54 share
+[opentenbase@VM_0_29_centos pgxz]$ 
+```
+
+- Configure environment variables for the pgxz user
+
+
+```
+[opentenbase@VM_0_29_centos ~]$ vim /data/opentenbase/.bashrc 
+# .bashrc
+
+# Source global definitions
+if [ -f /etc/bashrc ]; then
+        . /etc/bashrc
+fi
+
+export OPENTENBASE_HOME=/data/opentenbase/install/pgxz
+export PATH=$OPENTENBASE_HOME/bin:$PATH
+export LD_LIBRARY_PATH=$OPENTENBASE_HOME/lib:${LD_LIBRARY_PATH}
+```
+
+## Configure public parameters
+
+
+```
+[opentenbase@VM_0_29_centos ~]# mkdir -p /data/opentenbase/global/
+[opentenbase@VM_0_29_centos ~]#vim /data/opentenbase/global/postgresql.conf.user
+
+listen_addresses = '0.0.0.0'
+max_connections = 500
+max_pool_size = 65535
+shared_buffers = 1GB                    
+max_prepared_transactions = 2000
+maintenance_work_mem = 256MB
+wal_level = logical
+max_wal_senders = 64
+max_wal_size = 1GB
+min_wal_size = 256MB
+log_destination = 'csvlog'
+logging_collector = on
+log_directory = 'log'
+log_filename = 'postgresql-%A-%H.log' 
+synchronous_commit = local
+synchronous_standby_names = '' 
+```
+
+## Installation Configuration Topology Description
+
+Node Name | IP | Directory
+-------|:-----------:|-------------------------
+GTM primary | 172.16.0.29 |/data/opentenbase/data/pgxz/GTM
+GTM backup | 172.16.0.47 |/data/opentenbase/data/pgxz/GTM
+cn01	| 172.16.0.29	 | /data/opentenbase/data/pgxz/cn01
+cn02	| 172.16.0.47	 | /data/opentenbase/data/pgxz/cn02
+Dn01 primary | 172.16.0.29 |/data/opentenbase/data/pgxz/dn01
+Dn01standby | 172.16.0.47 |/data/opentenbase/data/pgxz/dn01
+Dn02 primary | 172.16.0.47 |/data/opentenbase/data/pgxz/dn02
+Dn02 | 172.16.0.29 |/data/opentenbase/data/pgxz/dn02
+
+
+# DN active-standby switchover
+## Simulate DN01 main fault
+
+
+```
+[opentenbase@VM_0_29_centos ~]# pg_ctl -Z datanode -D /data/opentenbase/data/pgxz/dn01 stop -m f  
+```
+
+## Lift DN01standby as the main
+
+
+```
+[opentenbase@VM_0_47_centos ~]# pg_ctl -Z datanode -D /data/opentenbase/data/pgxz/dn01 promote 
+```
+
+## CN01 Main Route Change
+
+
+```
+[opentenbase@VM_0_29_centos ~]# psql -h 172.16.0.29 -p 15432 -d postgres -U opentenbase
+psql (PostgreSQL 10.0 opentenbase V2)
+Type "help" for help.
+
+postgres=# alter node dn01 with (host='172.16.0.47',port=23001);
+```
+
+## CN02 Main Route Change
+
+
+```
+[opentenbase@VM_0_29_centos ~]# psql -h 172.16.0.47 -p 15432 -d postgres -U opentenbase
+psql (PostgreSQL 10.0 opentenbase V2)
+Type "help" for help.
+
+postgres=# alter node dn01 with (host='172.16.0.47',port=23001);
+```
+
+## DN01 Main Route Change
+
+
+```
+[opentenbase@VM_0_29_centos ~]# psql -h 172.16.0.47 -p 23001 -d postgres -U opentenbase
+psql (PostgreSQL 10.0 opentenbase V2)
+Type "help" for help.
+
+postgres=# alter node dn01 with (host='172.16.0.47',port=23001);
+```
+
+**Note here to connect to the new master.**
+
+## DN02 main route change
+
+
+```
+[opentenbase@VM_0_29_centos ~]# psql -h 172.16.0.47 -p 23002 -d postgres -U opentenbase
+psql (PostgreSQL 10.0 opentenbase V2)
+Type "help" for help.
+
+postgres=# alter node dn01 with (host='172.16.0.47',port=23001);
+```
+Note: The active-standby switchover of CN is similar to that of DN, except that the -Z parameter is changed to coordinator when simulating CN failure and promoting the standby node, so I will not repeat the PG _ CTL -Z coordinator-D ${ CN node data directory } [stop -m f | promote]
+
+# GTM active-standby switching
+## Mimic GTM master failure
+
+
+```
+[opentenbase@VM_0_29_centos ~]# gtm_ctl -Z gtm -D /data/opentenbase/data/pgxz/gtm stop 
+```
+## Promote GTM backup as the main
+
+
+```
+[opentenbase@VM_0_47_centos ~]# gtm_ctl -Z gtm -D /data/opentenbase/data/pgxz/gtm promote 
+```
+## CN01 Main Route Change
+
+
+```
+[opentenbase@VM_0_29_centos ~]# psql -h 172.16.0.29 -p 15432 -d postgres -U opentenbase
+psql (PostgreSQL 10.0 opentenbase V2)
+Type "help" for help.
+
+postgres=# alter gtm node gtm_1 with (host='172.16.0.47',port=21000);
+```
+## CN02 Main Route Change
+
+
+```
+[opentenbase@VM_0_29_centos ~]# psql -h 172.16.0.47 -p 15432 -d postgres -U opentenbase
+psql (PostgreSQL 10.0 opentenbase V2)
+Type "help" for help.
+
+postgres=# alter gtm node gtm_1 with (host='172.16.0.47',port=21000);
+```
+## DN01 Main Route Change
+
+
+```
+[opentenbase@VM_0_29_centos ~]# psql -h 172.16.0.47 -p 23001 -d postgres -U opentenbase
+psql (PostgreSQL 10.0 opentenbase V2)
+Type "help" for help.
+
+postgres=# alter gtm node gtm_1 with (host='172.16.0.47',port=21000);
+```
+
+**Note here to connect to the new master.**
+## DN02 main route change
+
+
+```
+[opentenbase@VM_0_29_centos ~]# psql -h 172.16.0.47 -p 23002 -d postgres -U opentenbase
+psql (PostgreSQL 10.0 opentenbase V2)
+Type "help" for help.
+
+postgres=# alter gtm node gtm_1 with (host='172.16.0.47',port=21000);
+```
+